Originally Posted by

**Paymemoney** Hi

Can someone tell me if my answers are correct?

A machine makes a special type of lining brick at the rate of 25 per hour. Overall about 5% of the bricks are

defective. Calculate:

The probability that no defective bricks are produced in any one hour?

Now this is a poisson distributions so i used the calculated by using the calculator function

poissonpdf(1.25,0) = 0.2865

however answer is 0.2774

the probability that two defective bricks are produced in any one hour?

poissonpdf(1.25,2) = 0.2238

however answer is 0.2305

the probability that at least one defective brick is produced in the next hour?

not sure about this one

P.S